AP Invoice Validation & Initiate Approval functionality

Hi Team

We have setup for AP approval as " Requires Validation Before Approval"

In AP invoice, after entering the invoice, we click the "Action 1" button, then first we click on Validate button to validate button. Once validation is completed, Initiate Approval button is enabled.

I remember in one of the project, both the buttons (Validate & Initiate Approval) were enabled. We were able to click both buttons together. If Invoice validation fails, then approval also fails.

Do anyone knows how to enable this? Which function / Menu is required to setup for this ? Also refer to note Doc ID 3061670.1. As per note, both buttons can be enabled at the same time.